A careful polish, not a new message
Improve corrects spelling, grammar, punctuation, word choice, and minor clarity issues. It keeps dates, names, links, identifiers, list structure, intent, and ownership intact.
Improve
Make a rough draft clear and natural—without changing what you mean.
Improve is the deliberate AI rewrite for a passage that needs more than one local correction. It preserves the source language and returns one reviewable version.
Kaku Rewrite
Original
昨日の会議で話した内容についてまとめたレポートを添付しました。
Improved420 ms
昨日の会議内容をまとめたレポートを添付しました。
Apply ImprovementCancel
When the whole passage feels rough
Use Improve for email, updates, or messages that are understandable but not yet fluent. It preserves English as English and Japanese as Japanese—it never translates.
Improve only when you ask
Select the passage, request a polish, and keep control of the final text.
Select the draft
Choose the sentence or passage that needs a clarity and fluency pass.
Run Improve
Kaku uses limited surrounding context to polish only the selected text.
Preview and apply
Compare the original and improvement before replacing anything.
Before and after
Clearer wording, same meaning
The passage stays in English and keeps the same claim; only the grammar and phrasing become natural.
Before
昨日の会議で話した内容についてまとめたレポートを添付しました。
After
昨日の会議内容をまとめたレポートを添付しました。
An explicit cloud action
Improve sends the selected passage and limited context needed for the rewrite only after you trigger it. The original is not replaced until you apply the result.
A polish inside your workflow
Select a passage in a supported desktop text field, open Kaku Rewrite, and return the improvement without moving the draft into another editor.
Keep exploring Kaku
Install Kaku on your desktop.
Kaku is a lightweight desktop app — not a browser extension. Sign in with Google after install to enable cloud features.
macOSBeta.dmg · Apple Silicon & IntelmacOS 13+
Windows.exe · Windows 10 / 11 · x64Coming soon